3-D GaAs radiation detectors

AR Meikle, RL Bates, K Ledingham, JH Marsh, K Mathieson, V O'Shea, KM Smith

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A novel type of GaAs radiation detector featuring a 3-D array of electrodes that penetrate through the detector bulk is described. The development of the technology to fabricate such a detector is presented along with electrical and radiation source tests. Simulations of the electrical characteristics are given for detectors of various dimensions. Laser drilling, wet chemical etching and metal evaporation were used to create a cell array of nine electrodes, each with a diameter of 60 μm and a pitch of 210 μm. Electrical measurements showed I–V characteristics with low leakage currents and high breakdown voltages. The forward and reverse I–V measurements showed asymmetrical characteristics, which are not seen in planar diodes. Spectra were obtained using alpha particle illumination. A charge collection efficiency of 50% and a S/N ratio of 3 : 1 were obtained. Simulations using the MEDICI software package were performed on cells with various dimensions and were comparable with experimental results. Simulations of a nine-electrode cell with 10 μm electrodes with a 25 μm pitch were also performed. The I–V characteristics again showed a high breakdown voltage with a low leakage current but also showed a full depletion voltage of just 8 V.
Original languageEnglish
Pages (from-to)198-203
Number of pages6
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume477
Issue number1-3
DOIs
Publication statusPublished - 21 Jan 2002

Fingerprint

Radiation detectors
radiation detectors
Electrodes
electrodes
Detectors
Electric breakdown
electrical faults
Leakage currents
detectors
leakage
cells
laser drilling
Alpha particles
simulation
Wet etching
radiation sources
Software packages
electrical measurement
alpha particles
Drilling

Keywords

  • radiation detectors
  • GaAs radiation detectors
  • electrodes

Cite this

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title = "3-D GaAs radiation detectors",
abstract = "A novel type of GaAs radiation detector featuring a 3-D array of electrodes that penetrate through the detector bulk is described. The development of the technology to fabricate such a detector is presented along with electrical and radiation source tests. Simulations of the electrical characteristics are given for detectors of various dimensions. Laser drilling, wet chemical etching and metal evaporation were used to create a cell array of nine electrodes, each with a diameter of 60 μm and a pitch of 210 μm. Electrical measurements showed I–V characteristics with low leakage currents and high breakdown voltages. The forward and reverse I–V measurements showed asymmetrical characteristics, which are not seen in planar diodes. Spectra were obtained using alpha particle illumination. A charge collection efficiency of 50{\%} and a S/N ratio of 3 : 1 were obtained. Simulations using the MEDICI software package were performed on cells with various dimensions and were comparable with experimental results. Simulations of a nine-electrode cell with 10 μm electrodes with a 25 μm pitch were also performed. The I–V characteristics again showed a high breakdown voltage with a low leakage current but also showed a full depletion voltage of just 8 V.",
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3-D GaAs radiation detectors. / Meikle, AR; Bates, RL; Ledingham, K; Marsh, JH; Mathieson, K; O'Shea, V; Smith, KM.

In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 477, No. 1-3, 21.01.2002, p. 198-203.

Research output: Contribution to journalArticle

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T1 - 3-D GaAs radiation detectors

AU - Meikle, AR

AU - Bates, RL

AU - Ledingham, K

AU - Marsh, JH

AU - Mathieson, K

AU - O'Shea, V

AU - Smith, KM

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